Start with the simplest method: the plunger
A standard cup plunger—the kind with a flat bottom, not a flange—clears most kitchen sink clogs in under five minutes. Fill the sink with enough water to cover the plunger cup by an inch or two. Place the plunger directly over the drain, press down firmly, and pull up sharply about 15 times in quick succession. The suction and pressure dislodge hair, soap buildup, and food particles stuck near the drain opening.
If your sink has a double basin, plug the overflow hole on the side of the sink with a wet cloth while you plunge. This keeps pressure from escaping and makes the plunger work harder on the clog. If you have a double basin with two drains, have someone hold a plunger over the second drain while you work the first one, or plug it with a wet cloth.
After plunging, run hot water down the drain for 30 seconds. If water drains freely, the clog is gone. If it still backs up, move to the next method.
Key Takeaways
- A cup plunger works on most kitchen clogs and requires no tools or chemicals beyond water.
- Baking soda and vinegar create a fizzing reaction that breaks up grease and soap buildup, though results vary depending on how deep the clog sits.
- A plumbing snake or wire coat hanger can physically pull out hair and debris that plunging cannot reach.
- If the clog is in the P-trap under the sink, you can unscrew it by hand and empty it directly into a bucket.
- Chemical drain cleaners damage old pipes and create safety hazards; they should be your last resort, and only if you follow the label exactly.
Use baking soda and vinegar to dissolve grease and soap
Pour half a cup of baking soda directly down the drain, followed by half a cup of white vinegar. The mixture will fizz and bubble—this is normal and means the reaction is working. Cover the drain with a plug or wet cloth to keep the fizz inside the pipe where it can break apart the clog. Let it sit for 15 to 30 minutes.
After the wait, boil a kettle of water and pour it slowly down the drain. The hot water flushes away the loosened debris. This method works best on clogs made of grease, soap scum, and mineral buildup. It does not work well on clogs made of solid objects like food chunks or hair tangles, which need physical removal.
If the drain still backs up after the baking soda treatment, the clog is likely deeper or made of material this method cannot dissolve. Do not repeat the baking soda step—move to a snake or P-trap removal instead.
Fish out the clog with a plumbing snake or wire hanger
A plumbing snake (also called a drain auger) is a long, flexible metal coil with a handle on one end. You feed it down the drain, and when it hits the clog, you crank the handle to break it apart or hook it so you can pull it back out. A 25-foot snake costs $15 to $30 and works on clogs 3 to 6 feet down the pipe. You can rent one from a hardware store for $5 to $10 per day if you do not want to buy.
If you do not have a snake, straighten a wire coat hanger and bend one end into a small hook. Feed it down the drain slowly and carefully—do not force it, or you may scratch the inside of the pipe. When you feel resistance, wiggle the hook and try to snag hair or debris. Pull it back out and repeat until water drains freely.
This method works on hair clogs, food buildup, and other solid blockages. It does not work on clogs caused by grease alone, because there is nothing solid to hook. If you feel the snake hit something hard and it will not budge, stop—you may have hit a bend in the pipe, and pushing harder can damage it.
Remove and empty the P-trap if the clog is underneath
The P-trap is the U-shaped pipe under your sink. Food, hair, and grease collect there because water slows down at the bend. If plunging and snaking the drain opening do not work, the clog is probably in the P-trap itself.
Place a bucket under the P-trap to catch water. Locate the two slip nuts—the large hexagonal fittings where the trap connects to the drain line above and the tailpiece below. Turn them counterclockwise by hand. If they are too tight, use a pipe wrench or adjustable wrench, but turn gently so you do not crack the plastic fitting. Once both nuts are loose, the trap will slide down and out.
Empty the trap into the bucket. You will see hair, grease, and debris clinging to the inside. Rinse it under running water and use an old toothbrush or bottle brush to scrub the inside clean. Screw the slip nuts back on by hand first, then tighten them with a wrench until snug—do not over-tighten, or you will strip the threads. Run water down the drain to check for leaks. A small drip at the nuts is normal for the first few minutes; if it continues, tighten slightly more.
When to call a plumber instead of trying more
Stop and call a plumber if the clog does not clear after you have tried plunging, baking soda and vinegar, and P-trap removal. At that point, the blockage is either deep in the main drain line, caused by tree roots, or the result of a structural problem like a collapsed pipe. These require professional equipment like a motorized snake, a camera inspection, or hydro-jetting.
Also call a plumber if you feel the snake hit something hard and will not move, or if you smell sewage backing up into your sink. These are signs of a problem beyond the trap or the first few feet of drain line.
If your sink has never drained well and clogs frequently, the issue may be a design problem with how the drain was installed, not a temporary blockage. A plumber can diagnose this and recommend a permanent fix.
Avoid chemical drain cleaners when possible
Chemical drain cleaners like Drano and Liquid-Plumr work by generating heat and caustic reactions that dissolve organic material. They can clear some clogs, but they carry real risks. The chemicals damage old plastic and metal pipes, can splash back and burn your skin or eyes, and create toxic fumes if mixed with other cleaners.
If you do use a chemical cleaner, follow the label instructions exactly. Wear gloves and eye protection. Do not mix it with anything else. Do not plunge after using it, because the chemical can splash up. Ventilate the room well. If the clog does not clear after one treatment, do not use the product again—call a plumber instead.
For most kitchen clogs, plunging or P-trap removal solves the problem without the safety risk. Save chemical cleaners for situations where you have already tried everything else and are willing to accept the hazard.
Prevent future clogs with straightforward habits
Most kitchen sink clogs come from grease, soap buildup, and hair. Wipe grease off dishes with a paper towel before washing them, rather than rinsing it down the drain. Use a drain strainer basket to catch food particles and hair. Empty the basket into the trash after each use.
Once a month, pour boiling water down the drain to dissolve soap and grease before they accumulate. If you notice the drain slowing down—water taking longer to empty—treat it right away with baking soda and vinegar or a plunger. A slow drain is easier to clear than a fully blocked one.
Frequently Asked Questions
Can I use a plunger on a double sink if both sides are clogged?
Yes, but you need to seal one drain while plunging the other. Have someone hold a wet cloth over the second drain opening, or use a second plunger if you have one. Without sealing the second drain, the pressure escapes and the plunger does not work.
What if the P-trap is leaking after I put it back together?
Tighten the slip nuts a quarter turn more with a wrench. If it still leaks, remove the trap again and check that the rubber washers inside the nuts are seated properly and not cracked. If a washer is damaged, replace it—they cost $1 to $3 at any hardware store.
Is it safe to mix baking soda and vinegar with hot water?
Yes. The reaction is safe and produces only carbon dioxide and water. The fizzing action helps break up the clog. Boiling water after the reaction is also safe and helps flush debris away.
How do I know if the clog is in the P-trap or deeper in the line?
If plunging does not work and the water backs up when ready when you run the sink, the clog is usually in the P-trap or the first few feet of drain line. Remove and clean the P-trap. If water still backs up after that, the clog is deeper and you need a plumber with a motorized snake.
Can I use a plumbing snake on PVC plastic pipes?
Yes, but gently. PVC is softer than metal and can crack if you push too hard or crank the snake handle with too much force. Feed the snake slowly and stop if you feel strong resistance. Do not force it through.